Determination of the aeration capacity of bubble columns by dynamic method. The influence of axial dispersion and of the start-up period

1979 ◽  
Vol 44 (9) ◽  
pp. 2583-2597 ◽  
Author(s):  
Václav Linek ◽  
Jiří Stejskal ◽  
Jiří Sinkule ◽  
Václav Vacek
Keyword(s):  
Dynamic Method ◽  
Dispersion Model ◽  
Oxygen Electrode ◽  
Axial Dispersion ◽  
Bubble Columns ◽  
Oxygen Probe ◽  
Start Up ◽  
Axial Dispersion Model ◽  
Aeration Capacity

A dynamic method for the determination of volumetric mass transfer coefficient of oxygen, kLa, in bubble columns using an oxygen electrode was derived on the basis of a liquid phase axial dispersion model The influence of aeration startup was studied assuming that the kLa value is position and time dependent. The conditions are defined under which the influence of aeration startup and of axial mixing of the liquid upon the steady state kLa value is negligible. A critical assessment has been made of various methods proposed for evaluation of oxygen probe responses.

Applicability of axial dispersion model to analyze mass transfer measurements in bubble columns

AIChE Journal ◽  
1983 ◽  
Vol 29 (6) ◽  
pp. 915-922 ◽  
Author(s):  
W.-D. Deckwer ◽  
K. Nguyen-Tien ◽  
B. G. Kelkar ◽  
Y. T. Shah
Keyword(s):  
Mass Transfer ◽  
Dispersion Model ◽  
Axial Dispersion ◽  
Bubble Columns ◽  
Axial Dispersion Model

Modelling of gaseous phase in bubble columns

1991 ◽  
Vol 56 (6) ◽  
pp. 1238-1248
Author(s):  
Jana Vašáková ◽  
Jan Čermák
Keyword(s):  
Gas Phase ◽  
Driving Force ◽  
Bubble Column ◽  
Dispersion Model ◽  
Correlation Method ◽  
Axial Dispersion ◽  
Bubble Columns ◽  
Axial Dispersion Model ◽  
Impulse Characteristics ◽  
Dispersion Layer

An axial dispersion model of a bubble column was verified by an experimental method based on pseudo-random binary signals of maximum length. The diameter of the column was 0.292 m and the height of the dispersion layer was 1.33 m. Water formed a stagnant liquid layer and a mixture of air with up to 5 vol.% of CO2 formed a streaming gas phase. The model was evaluated from the response of the bubble column to pseudo-random binary signals and from impulse characteristics calculated from this response by the correlation method. The use of the axial dispersion model with mass transfer was evaluated in dependence on the driving force.

Determination of aeration capacity of bubbled column type fermentors with oxygen electrode

1978 ◽  
Vol 43 (3) ◽  
pp. 713-718 ◽  
Author(s):  
Jaroslav Votruba ◽  
Miroslav Sobotka ◽  
Aleš Prokop
Keyword(s):  
Oxygen Electrode ◽  
Column Type ◽  
Aeration Capacity

Extra-Column Effects in Determination of Rate Parameters by the Chromatographic Method

1996 ◽  
Vol 61 (6) ◽  
pp. 844-855 ◽  
Author(s):  
Olga Šolcová ◽  
Petr Schneider
Keyword(s):  
Chromatographic Method ◽  
Dynamic Method ◽  
Axial Dispersion ◽  
Transport Parameters ◽  
Porous Particles ◽  
Loop Detector ◽  
Single Pellet ◽  
Set Up ◽  
Extra Column Effects

It was shown that the sampling loop, detector and connecting elements in the chromatographic set-up for determination of transport parameters by the dynamic method significantly influence the response peaks from columns packed with porous or nonporous particles. A method, based on the use of convolution theorem, was developed which can take these effects into account. The applicability of this method was demonstrated on the case of axial dispersion in a single-pellet-string column (SPSR) packed with nonporous particles. It is possible to handle also responses from columns packed with porous particles by a similar procedure.

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